Fix the play button throwing error

mix.php

@@ -29,8 +29,13 @@ if ($_SERVER['REQUEST_METHOD'] === 'PUT') {
     if (isset($data['mix']) && $data['mix'] != "") {
         $playcount = new Playcount($data['mix'], $db);
         $playcount->updatePlaycount();
+        echo json_encode(['success' => true]);
+    } else {
+        echo json_encode(['error' => 'No mix provided']);
     }
+    exit; // Stop further output
 }
+
 require_once 'includes/header.php'; ?>
     <section>
         <div class="container py-5">